Kawatani 【河谷】4 The Japanese surnames etymology dictionary.
① Topography . From the river in the north. Ishikawa-ken Komatsu-shi Tell Yazaki Town as Meiji New Last Name . Ishikawa-ken Kanazawa-shi There is a tradition in Oba-machi. In the Tochigi-ken Sano-shi celebration town, tell Kanagawa-ken Odawara-shi that it was originated in the north of the river with Kanagawa-ken after defeat in the battle of Ishibashi Yama which was in 1180 (4 years old).
② Origin of Kouchi-ken Aki-gun Kitagawa-mura . A place name with a record since the Azuchi-Momoyama period. Kouchi-ken Takaoka-gun Tsuno-chou Kitagawa is a stopover. A place name with a record since the Azuchi-Momoyama period. The place name tells that Mr. Kitagawa lived in from 1532 to 1555 (astronomical year).